**(16)** An observer standing on a cliff 80 meters above sea level sees a ship on the water. The angle of depression from the observer to the ship is 30 degrees. How far is the ship from the base of the cliff?

- (a) 80 meters
- (b) 160 meters
- (c) 40 meters
- (d) 40√3 meters

**(17)** A person standing on the edge of a cliff looks down at a river below. The angle of depression to the river is 45 degrees. If the cliff is 60 meters high, how wide is the river?

- (a) 60 meters
- (b) 60√2 meters
- (c) 120 meters
- (d) 120√2 meters

**(18)** A flagpole casts a shadow of 25 meters when the angle of elevation of the sun is 30 degrees. What is the height of the flagpole?

- (a) 15 meters
- (b) 20 meters
- (c) 25 meters
- (d) 30 meters

**(19)** A ladder is leaning against a wall. The ladder is 12 meters long, and its base is placed 9 meters away from the wall. What is the height at which the ladder touches the wall?

- (a) 4 meters
- (b) 6 meters
- (c) 8 meters
- (d) 10 meters

**(20)** A flagpole casts a shadow of 10 meters when the angle of elevation of the sun is 60 degrees. What is the height of the flagpole?

- (a) 5 meters
- (b) 10 meters
- (c) 15 meters
- (d) 20 meters